The natural abundance of the three stable isotopes of magnesium is approximately 79.0…

CHEMISTRY · Subjective · A Level · Chemistry · Atomic structure · Atomic structure

Problem

The natural abundance of the three stable isotopes of magnesium is approximately 79.0 % for

^{24}\text{Mg}

, 10.0 % for

^{25}\text{Mg}

, and 11.0 % for

^{26}\text{Mg}

. Two solid magnesium samples were analyzed, giving the following relative abundances: • Sample A:

^{24}\text{Mg}

90 %,

^{25}\text{Mg}

5 %,

^{26}\text{Mg}

5 % • Sample B:

^{24}\text{Mg}

70 %,

^{25}\text{Mg}

15 %,

^{26}\text{Mg}

15 % Identify which sample is enriched in

^{25}\text{Mg}

relative to the natural abundance and briefly state the evidence from the data that supports your choice.